Quantitative analysis of the EEG in the intracarotid amobarbital procedure. I. Amplitude analysis

Geoffrey L. Ahern, David M. Labiner, Ronald Hutzler, Cheryl Osburn, Dinesh Talwar, Anne M. Herring, Julie N. Tackenberg, Martin E. Weinand, Kalarickal J. Oommen

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Thirty-seven subjects underwent bilateral internal carotid artery injections of amobarbital prior to surgery for intractable epilepsy. The electroencephalogram (EEG) of these patients was continuously monitored during these 74 procedures and was later subjected to quantitative analysis. Topographic mapping of these data suggested that the areas of inactivation were largely restricted to the anterior 2/3 of the hemisphere injected, corresponding to the vascular distributions of the anterior and middle cerebral arteries. Graphical representation of the data demonstrated that delta and theta band activity peaked in the first 2 min post injection and decreased gradually thereafter, becoming stable at around 12 min post injection. Examination of the alpha, beta1, and beta2 bands suggested that activity increased and decreased more gradually than that for delta and theta, with perhaps a longer latency. Although EEG changes were most prominent in the anterior 2/3 of the inactivated hemisphere, similar (though smaller) changes were also observed in both ipsilateral and contralateral zones thought to be outside of the vascular distribution of the internal carotid artery.

Original languageEnglish (US)
Pages (from-to)21-32
Number of pages12
JournalElectroencephalography and Clinical Neurophysiology
Issue number1
StatePublished - Jul 1994


  • Amobarbital
  • EEG
  • Epilepsy
  • Intracarotid sodium amobarbital (ISA)
  • Quantitative EEG
  • Wada test

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology


Dive into the research topics of 'Quantitative analysis of the EEG in the intracarotid amobarbital procedure. I. Amplitude analysis'. Together they form a unique fingerprint.

Cite this